The chart displays cumulative reported COVID-19 cases across Berlin’s districts from January 1 to November 9, 2021, using a line with circular markers. It is rendered as SVG via React components, with scales from d3.scaleTime and d3.scaleLinear, and axes built with custom tick components. The line path and circles are generated using d3.line and d3.curveNatural, while hover tooltips use native SVG `<title>` elements. Data is loaded asynchronously from a CSV via d3.csv, and the visualization is based on public Berlin open data.